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Control device for video display module

  • US 4,141,003 A
  • Filed: 02/07/1977
  • Issued: 02/20/1979
  • Est. Priority Date: 02/07/1977
  • Status: Expired due to Term
First Claim
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1. In a video display module which includes a local data memory, character generation circuitry, and a display monitor having a display screen;

  • a display control device comprising address storage means for storing a line address of said memory;

    address counter means for incrementing or decrementing said line address, said address counter means input connected to said address storage means and output connected to said local data memory;

    displacement storage means for storing a displacement parameter number proportional to the vertical distance between the top of said display screen and the beginning of the display;

    displacement counter means connected to the output of said displacement storage means for incrementing or decrementing said displacement parameter number;

    latch means for generating a video blanking signal;

    logic means connected to the output of said displacement counter means for resetting said latch means whenever said displacement counter means counts to a predetermined number; and

    vertical retrace signal means for resetting said latch means.

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